From 10cedc3615d10af8e6a871284ea612f9505173fb Mon Sep 17 00:00:00 2001
From: Sai Sahith <91070868+sai-sahith7@users.noreply.github.com>
Date: Mon, 30 May 2022 22:04:04 +0530
Subject: [PATCH 1/2] day1

---
 POD/Week2-Strings/day1.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 POD/Week2-Strings/day1.py

diff --git a/POD/Week2-Strings/day1.py b/POD/Week2-Strings/day1.py
new file mode 100644
index 0000000..2fe8e14
--- /dev/null
+++ b/POD/Week2-Strings/day1.py
@@ -0,0 +1,15 @@
+class Solution:
+    def isIsomorphic(self, s: str, t: str) -> bool:
+        d = dict()
+        flag = True
+        l = len(t)
+        for i in range(l):
+            if s[i] not in d.keys():
+                if t[i] in d.values():
+                    flag = False
+                    break
+                d[s[i]] = t[i]
+            elif d[s[i]] != t[i]:
+                flag = False
+                break
+        return flag

From 5205ca2e29008ced673c9949d9876d141dd1859d Mon Sep 17 00:00:00 2001
From: Sai Sahith <91070868+sai-sahith7@users.noreply.github.com>
Date: Tue, 31 May 2022 20:35:53 +0530
Subject: [PATCH 2/2] commit day-1

upated comments
---
 POD/Week2-Strings/day1.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/POD/Week2-Strings/day1.py b/POD/Week2-Strings/day1.py
index 2fe8e14..f04debe 100644
--- a/POD/Week2-Strings/day1.py
+++ b/POD/Week2-Strings/day1.py
@@ -1,15 +1,15 @@
 class Solution:
     def isIsomorphic(self, s: str, t: str) -> bool:
-        d = dict()
+        d = dict()  #dictionary to allot characters of s as keys and characters of t as values
         flag = True
         l = len(t)
         for i in range(l):
-            if s[i] not in d.keys():
-                if t[i] in d.values():
+            if s[i] not in d.keys():   #checking if the character of s has already been allotted to a character of t
+                if t[i] in d.values(): #checking if character of t has been allotted to different character of s
                     flag = False
                     break
-                d[s[i]] = t[i]
-            elif d[s[i]] != t[i]:
+                d[s[i]] = t[i]     #alloting a character of s to character of t
+            elif d[s[i]] != t[i]:  #checking if character of t is not equal to previously allotted character in dictionary
                 flag = False
                 break
         return flag